Also regenerate the list of Prometheus Blackbox targets, adding:

- https://london.mirror.pkgbuild.com
- https://package-maintainer-bylaws.aur.archlinux.org

This shell behavior[1] in Bash 5.2 "expands occurrences of '&' in the
replacement string of pattern substitution to the text matched by the
pattern" but we want literal ampersands so escape them.

[1] https://www.gnu.org/software/bash/manual/html_node/The-Shopt-Builtin.html

Similarly to geo.mirror.pkgbuild.com, this is monitored elsewhere.

We want non-DevOps to be able to deploy project documentation (ex:
repod) with GitLab Pages and a separate domain was considered the only
sensible solution due to security issues[1].

[1] https://github.blog/2013-04-09-yummy-cookies-across-domains/

roles/prometheus/defaults/main.yml used to include a comment with the
commands used to generate a list of HTTPS endpoints to check. Move it
into a proper script and fix it to generate the correct current list.